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Romeo Knapp
Mathematics
6 December, 16:18
21x3 - 9x2 - 28x + 12
+4
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1
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Myla Mcdowell
6 December, 16:32
0
(7x-3) (3x^2 - 4)
Step-by-step explanation:
21x^3 - 9x^2 - 28x + 12
We can factor by grouping
Factor out 3x^2 from the first two terms and - 4 from the last two
21x^3 - 9x^2 - 28x + 12
3x^2 (7x-3) - 4 (7x-3)
Now factor out (7x-3)
(7x-3) (3x^2 - 4)
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